Added multimaster test

tests/integration/multimaster-psync.tcl

@@ -0,0 +1,43 @@
+start_server {tags {"repl"} overrides {active-replica {yes} multi-master {yes}}} {
+    start_server {overrides {active-replica {yes} multi-master {yes}}} {
+        test {2 node cluster heals after multimaster psync} {
+            set master [srv -1 client]
+            set master_host [srv -1 host]
+            set master_port [srv -1 port]
+            set replica [srv 0 client]
+            set replica_host [srv 0 host]
+            set replica_port [srv 0 port]
+
+            # connect two nodes in active-active
+            $replica replicaof $master_host $master_port
+            $master replicaof $replica_host $replica_port
+            after 1000
+
+            # write to db7 in the master
+            $master select 7
+            $master set x 1
+
+            # restart the replica to break the connection and force a psync
+            restart_server 0 true false
+            set replica [srv 0 client]
+
+            # write again to db7
+            $master set y 2
+
+            # uncommenting the following delay causes test to pass
+            # after 1000
+
+            # reconnect the replica to the master
+            $replica replicaof $master_host $master_port
+
+            # verify results
+            after 1000
+            for {set j 0} {$j < 16} {incr j} {
+                $master select $j
+                $replica select $j
+                assert_equal [$replica get x] [$master get x] 
+                assert_equal [$replica get y] [$master get y]
+            }
+        }
+    }
+}